2.2.0.25falsefalse4071 - Disclosure - Investment in Unconsolidated Entities (Details 2)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $D2010http://www.sec.gov/CIK0001063761duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $D2009http://www.sec.gov/CIK0001063761duration2009-01-01T00:00:002009-12-31T00:00:00SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $D2008http://www.sec.gov/CIK0001063761duration2008-01-01T00:00:002008-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$3true0spg_LoansToSPG-FCMItemListAbstractspgfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseLoans To SPG-FCM4false0spg_NotesReceivableRelatedPartyReferenceRatespgfalsenadurationThe reference rate for the variable rate of a note receivable such as LIBOR or the US Treasury rate.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00LIBORLIBORfalsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe reference rate for the variable rate of a note receivable such as LIBOR or the US Treasury rate.No authoritative reference available.falsefalseBase interest rate for loans to SPG-FCM and Mills5false0us-gaap_NotesReceivableRelatedPartiesus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse651000000651000000falsetruefalsefalsefalse2truefalsefalse632000000632000000falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFor an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 16, 17 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph d Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 7 falsefalseLoan receivable from SPG-FCM6false0spg_RelatedPartyInterestIncomeNetspgfalsecreditdurationInterest income earned on notes receivable from related parties during the reporting period, net of inter-entity...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse99000009900000falsefalsefalsefalsefalse2truefalsefalse93000009300000falsefalsefalsefalsefalse3truefalsefalse1530000015300000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryInterest income earned on notes receivable from related parties during the reporting period, net of inter-entity eliminations.No authoritative reference available.falsefalseInterest income from SPG-FCM and Mills loans, net of inter-entity eliminations7false0spg_RelatedPartyFinancingFeeIncomespgfalsecreditdurationFinancing fee income earned on notes receivable from related parties during the reporting period, net of inter-entity...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse900000900000falsetruefalsefalsefalse2truefalsefalse37000003700000falsetruefalsefalsefalse3truefalsefalse31000003100000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFinancing fee income earned on notes receivable from related parties during the reporting period, net of inter-entity eliminations.No authoritative reference available.falsefalseFinancing fee income from SPG-FCM and Mills loans, net of inter-entity eliminations8false0spg_NotesReceivableRelatedPartyStatedVariableRatespgfalsenainstantThe number of basis points added to the reference rate to compute the variable interest rate for the related party note...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsetruefalse00falsefalsefalsefalsefalse2truetruefalse0.02750.0275falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe number of basis points added to the reference rate to compute the variable interest rate for the related party note outstanding at the balance sheet date.No authoritative reference available.falsefalseBasis points added to base rate for remaining loan to SPG-FCM (as a percent)9false0spg_NotesReceivableRelatedPartiesMaturityDateExtensionsNumberspgfalsenainstantThe number of one-year loan maturity date extensions.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse11falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerThe number of one-year loan maturity date extensions.No authoritative reference available.falsefalseNumber of one-year extensions available for SPG-FCM loan after June 8, 201137Investment in Unconsolidated Entities (Details 2) (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue